Spark-plug core



H. J. SEELY.

SPARK PLUG CORE- APPLICATION FILED NOV-7,1921.

Patented. Aug. 1,1922.

flej J -11m UNHTW HARRY J. SEELY, OF LOS ANGEL ES, CALIFORNIA.

SIP-PLUG COB/E.

Specification of Letters Patent.

Patented Aug. 1, 1922.

Application filed November 7, 1921. Serial No. 513,358.

vention being to provide a plug which may be readily and easilydismantled to permit the cleaning of the plug with facility.

Another object of the invention is to provide a plug wherein thepositive and negative electrodes are carried by the core to be removedtherewith.

A still furtherobject of the invention is to provide novel means forinsuring the grounding of the negative electrode.

With the foregoing and other objects .in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and. claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, may be made within thescope of what is claimed, without departing from the spirit of theinvention.

Referring to the drawing I The figure is a longitudinal sectional viewthrough a spark plug constructed in accordance with the presentinvention.

Referring to the drawing in detail, the shell embodies an upper section5 and a lower section 6, the lower section being provided with athreaded portion? to permit the same to be positioned in the usual sparkplug opening of an internal combustion engine.

he lower section 6 is also formed with an enlarged portion 8 which hasconnection with the lower portion 7 as by means of the inclined walls 9which rovide a seat for the core 10 to be hereina ter more fullydescribed.

The enlarged portion 8 is internally threaded to accommodate the threads11 of the upper section 5 whereby the core may As shown, the core isprovided with an enlarged central portion 16 having an inclined lowerwall 17 contacting with the gasket 14 which is positioned between thecore and inclined wall 9 of' the lower section. Thus it will be seenthat the core 10 is held within the sections of the shell in a manner toprevent movement of the core with relation thereto.

An electrode 18 extends through the core and has its lower extremityterminating at a point in spaced relation with the lower end of thecore, where the same extends inwardly as at 19,- the same being arrangedin close proximity to the end 20 of the negative electrode, that is alsoembedded in the core. This electrode 21 has its upper extremityterminating short of the upper end of the core, and as shown, an opening22 is formed in the core adjacent to the shoulder 15, the opening beingdesigned to accommodate the coiled spring 23 which is shown aspositioned therein, one end of the coiled spring being in engagementwith the upper extremity of the electrode 21, while the opposite end ofthe coiled spring 23 engages the metal gasket 14 to ground the currentpassing through the electrodes.

At the upper end of the core, are provided the nuts 24 which operate onthe threaded portion 25 of the electrode 18, and provide means forsecuring a terminal thereto. Thus it will be seen that when it isdesired to disassemble the elements of the plug, it is only necessary torotate the upper section 5 to disengage the threads 11 and internalthreads of the enlargement 16 whereupon the core may be withdrawn fromthe shell.

When the core is replaced, the coiled spring is positioned in itsopening, and the gasket 14 is positioned over the spring to compress thesame and force the opposite end thereof into engagement with thenegative electrode of the plug.

Having thus described the invention, what is claimed as new is:--

1. In a spark plug, a shell including opposed sections, a core supportedwithin the shell, an electrode extending through the core, said corehaving an opening formed in the side thereof, an electrode having oneend terminating at a point adjacent to one end of the opening, theopposite end of the last mentioned electrode being disposed in proximityto the first mentioned electrode to provide sparking points, a gasketdisposed disposed between the core and shell, and a coiled springcontacting with the gasket and one of the electrodes to ground a circuitpassing throu h the plug.

3. In a spar plug, a shell embodying opposed sections, alcore positionedwithin the shell and clamped between the sections, electrodes in the'core, said core having an opening, resilient means positioned in theopening and contacting with one of the electrodes, a gasket supportedbetween the core and shell and contacting with the resilient means toground a circuit through the'shell.

In testimony that I claim the fore oing as my own, I have hereto afiixedmy signature in the presence of two witnesses.

' HARRY J. SEELY.

